Haematological changes in cynomolgus monkeys experimentally infected with HEV. Lymphopenia was observed in the HEV-inoculated groups. An average lymphocyte was calculated at each of nine time points for all monkeys in each group (A) and in individuals (B). A trend toward monocytosis was observed in the inoculated groups. An average monocyte count for all HEV-inoculated monkeys in each group (C), and significant differences were observed in some individuals (D) (ANOVA, **P < 0.01, *P < 0.05).